Revert "sched: Add new scheduler syscalls to support an extended scheduling parameters ABI"

This reverts commit 50f8b04c. This commit
depends on a commit which is causing audio regressions. Until its
dependency can be brought it, it should be removed.

Change-Id: Ia6c00e7744a5d4e562299ddb4cabe4fbab65e9bc
Signed-off-by: Ian Maund <imaund@codeaurora.org>